Cloudflare Workers Vulnerable to Spectre Attack, Leaking JWTs at Low Data Rates

Cybersecurity researchers have successfully demonstrated a remote Spectre attack targeting Cloudflare Workers, achieving a significant increase in data leakage speed. This advanced attack, detailed in a recent paper, managed to exfiltrate a JSON Web Token (JWT) from a co-located Worker in Cloudflare’s production environment at a rate of up to 12 bits per second. This [...]